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Author Topic: My Completed 'Script Era' MXR Dyna Comp Clone Build  (Read 3007 times)

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Steve Mavronis

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My Completed 'Script Era' MXR Dyna Comp Clone Build
« on: March 25, 2011, 07:33:04 PM »
Here are final completed pics of my latest build, my take on a reverse engineered clone of the 1976-1977 era MXR Dyna Comp. Custom PCB layout designed in ExpressPCB and graphics made with GIMP. Special thanks to Rick (Frequency Central) and Pete (Scruffie) for their CA3080 donation offers that helped make this project possible! I'll build one more copy to serve as a spare backup using the other CA3080. I've never used a compressor effect before so this is all new to me! Thank you for following this thread. This project is done!








My DIY stompbox builds:
- Neo-Classic 741 Overdrive (gray spec 250 Overdrive clone)
- MXR Distortion+ (diy replica pcb replacement 1980 block logo)
- Neo-Classic 3080 Compressor (script spec Dyna Comp clone)
- DOD YJM308 Overdrive (250 gray spec mod)

earthtonesaudio

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Re: My Completed 'Script Era' MXR Dyna Comp Clone Build
« Reply #1 on: March 25, 2011, 07:56:25 PM »
Outstanding!

Beautiful inside and out.  Well done Steve.
Wow. Looks like you've got all the parts you need to make a thermostat right there buddy. Cool! Hot!
R. Holt MMX

Adji

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Re: My Completed 'Script Era' MXR Dyna Comp Clone Build
« Reply #2 on: March 26, 2011, 12:08:51 PM »
Outstanding indeed! So neat and tidy and professional looking!

frequencycentral

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Re: My Completed 'Script Era' MXR Dyna Comp Clone Build
« Reply #3 on: March 26, 2011, 02:20:08 PM »
Totally. What I like about Steve's builds, quite apart from the finished product is the prolonged gestation period. He scours the internet for every version of the schematic, pours over them in detail, agonises over the layout and graphics, hell - even the resistor bending. I think I remember talking the Steve about this build last summer - I sent him the metal can 3080 six months ago. I couldn't roll like that - but I respect Steve immensely for his style and dedication.

Now Steve, how about some pedal porn of your Neo Classic 741 and 3080 both together?  

....and yeah! What's next Steve? Neo Classic Phase 90 maybe? I'll look forward to seeing it......in about 18 months.  ;)
« Last Edit: March 26, 2011, 02:22:47 PM by frequencycentral »

Steve Mavronis

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Re: My Completed 'Script Era' MXR Dyna Comp Clone Build
« Reply #4 on: March 26, 2011, 04:32:43 PM »
\What I like about Steve's builds, quite apart from the finished product is the prolonged gestation period. He scours the internet for every version of the schematic, pours over them in detail, agonises over the layout and graphics, hell - even the resistor bending. I think I remember talking the Steve about this build last summer - I sent him the metal can 3080 six months ago. Now Steve, how about some pedal porn of your Neo Classic 741 and 3080 both together? What's next Steve? Neo Classic Phase 90 maybe? I'll look forward to seeing it......in about 18 months.  ;)

Here's some 'pedal porn threesome action' in the pic below for you! I'm about on average completing about one 'new' pedal clone per year, although this compressor is my third physical build since I built two of the overdrive last year. In the coming weeks I'm going to build a spare 3080 Compressor, and a spare 741 Overdrive since I had given my original extra copy away. I don't know what's next; maybe a regulated power supply for actual pedalboard I should buy or make instead of using a bookshelf and three wall warts?

My main problem is I have no dedicated work space to build anything. I'm literally going back and forth between my PC and kitchen counter top, which my wife simply loves - yeah right LOL. If I don't start cleaning things off the counter she will do it for me and then I lose everything. Talk about poor working conditions! Someone should tell her. ;)



Strat->NS2send->Compressor->Overdrive->NS2return->Amp
« Last Edit: April 03, 2011, 04:52:04 PM by Steve Mavronis »
My DIY stompbox builds:
- Neo-Classic 741 Overdrive (gray spec 250 Overdrive clone)
- MXR Distortion+ (diy replica pcb replacement 1980 block logo)
- Neo-Classic 3080 Compressor (script spec Dyna Comp clone)
- DOD YJM308 Overdrive (250 gray spec mod)

Steve Mavronis

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Re: My Completed 'Script Era' MXR Dyna Comp Clone Build
« Reply #5 on: April 01, 2011, 09:01:43 PM »
Here's my as-built schematic. The PCB circuit region is based on a re-drawn MXR schematic:

My DIY stompbox builds:
- Neo-Classic 741 Overdrive (gray spec 250 Overdrive clone)
- MXR Distortion+ (diy replica pcb replacement 1980 block logo)
- Neo-Classic 3080 Compressor (script spec Dyna Comp clone)
- DOD YJM308 Overdrive (250 gray spec mod)

picod

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Re: My Completed 'Script Era' MXR Dyna Comp Clone Build
« Reply #6 on: April 02, 2011, 05:37:20 AM »
What tool do you use to bend the resistors?

Steve Mavronis

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Re: My Completed 'Script Era' MXR Dyna Comp Clone Build
« Reply #7 on: April 02, 2011, 08:39:25 AM »
What tool do you use to bend the resistors?

Just by hand using the tips of round nose pliers as a bending point.
My DIY stompbox builds:
- Neo-Classic 741 Overdrive (gray spec 250 Overdrive clone)
- MXR Distortion+ (diy replica pcb replacement 1980 block logo)
- Neo-Classic 3080 Compressor (script spec Dyna Comp clone)
- DOD YJM308 Overdrive (250 gray spec mod)

T-diddy

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Re: My Completed 'Script Era' MXR Dyna Comp Clone Build
« Reply #8 on: August 05, 2011, 09:53:08 AM »
I just saw this.....Wow......Very Nice build.  Congrats :D

atreidesheir

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Re: My Completed 'Script Era' MXR Dyna Comp Clone Build
« Reply #9 on: August 20, 2011, 10:39:02 AM »
yep.  that's hot. ;)

Steve Mavronis

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Re: My Completed 'Script Era' MXR Dyna Comp Clone Build
« Reply #10 on: September 21, 2011, 10:49:40 PM »
Thanks guys! I'll be playing with my overdrive and compressor builds for a while. No clue what I'd want to tackle next for a DIY build maybe in 2012.

I just completed one more that I shipped for free to a friend as a personal gift. That one used a CA3080E chip instead of a metal can IC. I also just got five CA3080A metal cans RCA with a 127 date code, that someone offered as a trade for the two left over NC3080Comp boards I still had. Does anyone know what year that is?

The CA3080S metal can (in the photo) is RCA with a date code of 426. I don't know if there is any advantage of the A version vs. the S version. I guess a CA3080A is closer to what the late 70's Dyna Comp had used.
My DIY stompbox builds:
- Neo-Classic 741 Overdrive (gray spec 250 Overdrive clone)
- MXR Distortion+ (diy replica pcb replacement 1980 block logo)
- Neo-Classic 3080 Compressor (script spec Dyna Comp clone)
- DOD YJM308 Overdrive (250 gray spec mod)

effdub

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Re: My Completed 'Script Era' MXR Dyna Comp Clone Build
« Reply #11 on: September 21, 2011, 11:48:48 PM »
Shit man, that's a tight build.  :)
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